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Accueil > A propos du LPP > Communication > Actualités archivées > 2025 > Novel detection scheme for highly-reactive methyl radicals demonstrated

Novel detection scheme for highly-reactive methyl radicals demonstrated

Toutes les versions de cet article : [English] [français]

Methyl radicals (CH3) are very reactive particles that play an essential role all hydrocarbon-containing discharges. However, their high reactivity impedes quantitative detection. In collaboration with Nelson de Oliveira from the Soleil Synchrotron facility, LPP’s plasma-based gas conversion team, led by Olivier Guaitella, demonstrated that it is possible to detect CH3 with higher sensitivity compared to conventional techniques by using absorption spectroscopy with wavelengths around 150nm.

Using a synchrotron, radiation around 150nm in wavelength is produced that passes through a low-temperature plasma, provided with methane (CH4) and oxygen (O2). The produced CH3 absorbs part of the light, allowing us to determine the CH3 density. With the admixture of O2, the CH3 density is not monotonously decreasing due to oxidation but passes through a maximum.

Voir en ligne : In-situ quantitative measurements of methyl radicals in oxygen-containing reactive environments by VUV absorption spectroscopy using synchrotron radiation

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